This actor reads a file or URL, one line at a time, evaluates each
line as an expression, and outputs the token resulting from the
evaluation. The first line in the file determines the data type
of the output. All other lines must contain expressions that
evaluate to the same type or a subtype, or a run-time type error will occur.
The file or URL is specified using any form acceptable
to FileParameter. If an end of file is reached, then prefire() and
postfire() will both return false.
Edward A. Lee
$Id: ExpressionReader.java 70398 2014-10-22 23:44:32Z cxh $
Ptolemy II 2.2
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